body{
    background-image: url("https://cn.bing.com/th?id=OHR.CorfeDorset_ZH-CN8002715956_UHD.jpg&rf=LaDigue_UHD.jpg&pid=hp&w=1920&h=1080&rs=1&c=4");
}

/*让块左右居中*/
.center{
    /*上下外边距为0，左右外边距为自动，就是左右边距相等*/
    margin: 0 auto;
}

/*顶部展示logo块*/
.top{
    width: 100%;
    height: 80px;
}

/*logo图片位置*/
.top .logo{
    width: 1400px;
    height: 100%;
}

.top .logo img{
    border: none;
    width: 300px;
    height: 100%;
}

/*logo样式*/
.navbar-brand{
    width: 180px;
    height: 48px;
    padding-left:6px;
    font-size: 23px;
    font-style:italic;
    font-weight: bold;
    font-family:sans-serif;
}

/*main窗体的高度可以指定*/
.main{
    width: 100%;
    /*设置为绝对以填充满整个界面*/
    position: absolute;
    top: 50px;
    left: 0;
    bottom: 0;
    right: 0;
}

/*登录窗体外部框*/
.login{
    width: 100%;
    height: 450px;
    background-color: rgba(0,0,0,0.4);
    /*position:absolute;*/
    /*right:10%;*/
    /*top:25%;*/
    border-radius: 15px;
}

.login_center{
    padding: 20px;
}

.login_top{
     color: #e4e0e0;
     font-weight: bold;
     font-size: 20px;
 }

.login_info{
    font: 18px Times New Roman;
    height: 40px;
    line-height: 40px;
    margin: 35px 0;
    color: white;
}

.login_info_input{
    width: 100%;
    height: 30px;
    border: 1px solid #ccc;
    padding: 5px 10px;
}

/*登录和注册按钮外部框*/
.login_buttons{
    width: 90%;
    position: absolute;
    bottom: 5%;
    left: 5%;
    right: 5%;
}

/*登录注册按钮*/
.button{
    border: none;
    width: 100%;
    height: 40px;
    background-color: beige;
    border-radius: 10px;
    margin-top: 10px;
    size: 10px;
    font-weight: bold;
}

.foot{
    background-color: rgba(255,255,255,0.75);
}